Anthropogenic gadolinium sources and remediation in highly urbanized river in the Beijing-Tianjin-Hebei (BTH) region, China: Insights from buffer zone and three-dimensional tracer system

• Xi GaoChina University of Geosciences
• Guilin HanChina University of Geosciences
• Shitong ZhangChina University of Geosciences
• Jinke LiuChina University of Geosciences
• Di WangChina University of Geosciences
• Shunrong MaChina University of Geosciences
• Yuqing ZhaoChina University of Geosciences